SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Results of Operations for Oil and Gas Producing Activities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		7 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Oil and Gas Information [Abstract]
Revenues from oil and gas producing activities			$ 2,616	$ 4,710
Production and delivery costs			(682)	(1,237)
Depreciation, depletion and amortization			(1,358)	(2,265)
Impairment of oil and gas properties	(3,400)	(308)	0	(3,737)	0	0
Income tax benefit (expense) (based on FCX's statutory tax rate)			(219)	958
Results of operations from oil and gas producing activities			$ 357	$ (1,571)